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50 Freedom SW 230V Installation Guide
Stacking Features
Example 4:
System composed of two stacked Freedom SW 3524-
230s. Each Freedom SW 3524-230 has a maximum charge capacity of
90A
.
The two stacked
Freedom SW 3524-230
inverter/chargers
connected to the same battery bank can possibly produce a total of
180A.
The industry’s commonly accepted practice suggests a typical
Flooded battery bank capacity (C) of 600Ah
should not be charged
beyond 25% of its capacity (150A). Therefore, when configuring
the two stacked Freedom SW chargers, each charger may have a
maximum charger output current of 75A
(that is, 600 × 25% ×
1
/
2
)
into the common battery bank as described in the Calculations
section. Also, the System Total BULK output current is calculated
as 150A (that is, 75A + 75A).
To set the
Max Chg Rate
(%) setting in each
Freedom SW 3524-230:
1. Divide the maximum allowable charger output current of 75A
by the
Freedom SW 3524-230’s maximum charge capacity of
90A.
So, 75 ÷ 90, gets an approximate value of 0.83 (or 83%) which
can be set exactly to 83%.
2. Set the Max Chg Rate (%) setting to 83 which means 83%.
In this example, the actual output current is limited to 83% of 90A
which is 74A. Therefore, the actual System Total BULK output
current comes out to just under 150A.
Freedom SW 3K2K 230V InvChg Install Guide.book Page 50 Friday, June 20, 2014 9:11 AM